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Propagation of optical vortex beams and nucleation of vortex-antivortex pairs in disordered nonlinear photonic lattices
- Source :
- Journal of the Korean Physical Society; December 2014, Vol. 65 Issue: 12 p2040-2044, 5p
- Publication Year :
- 2014
-
Abstract
- The propagation of optical vortex beams through disordered nonlinear photonic lattices is numerically studied. The vortex beams are generated by using a superposition of several Gaussian laser beams arranged in a radially-symmetric manner. The paraxial nonlinear Schrödinger equation describing the longitudinal propagation of the beam array through nonlinear triangular photonic lattices with two-dimensional disorder is solved numerically by using the split-step Fourier method. We find that due to the spatial disorder, the vortex beam is destabilized after propagating a finite distance and new vortex-antivortex pairs are nucleated at the positions of perfect destructive interference. We also find that in the presence of a self-focusing nonlinearity, the vortex-antivortex pair nucleation is suppressed and the vortex beam becomes more stable, while a self-defocusing nonlinearity enhances the vortex-antivortex pair nucleation.
Details
- Language :
- English
- ISSN :
- 03744884 and 19768524
- Volume :
- 65
- Issue :
- 12
- Database :
- Supplemental Index
- Journal :
- Journal of the Korean Physical Society
- Publication Type :
- Periodical
- Accession number :
- ejs34582986
- Full Text :
- https://doi.org/10.3938/jkps.65.2040